Microwave oven



FIG. 1 is a front perspective view of a microwave oven showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevational view thereof; and

FIG. 5 is a right side elevational view thereof.

The characteristic feature of the design resides in the front face of the microwave oven. 

The ornamental design for a microwave oven, as shown and described. 